Please report any problem which you encountered during your observation by email to eff-support[at]mpifr-bonn.mpg.de (Please exchange [at] by the '@' to send an email to the Effelsberg support team).
When doing so, please give: (1) your name, (2) date and time of the observation, (3) used receiver, (4) a clear description of the problem.
If possible, provide some figures. Thanks!